The blur problem Parallel sessions are anonymous by default. The harness hands each one an ID at boot, and then nothing surfaces it anywhere you actually look. Every terminal pane shows the same shape. Every file that lands on disk carries no mark of which session made it. Anonymous sessions make anonymous artifacts, and once an artifact leaves the session, its provenance is gossip. You either remember which pane produced it, or you dig. The count, from my own week: twelve sessions ran in parallel last week. Builds, audits, research legs, a render pipeline. Today I can tell zero of them apart by looking at their output. Three days after the fact, a handoff doc asked the only question that mattered, which session wrote this, and answering it cost an hour of archaeology through git logs and file timestamps. That hour is the tax, and it recurs every time you add a session. ----------------------------------------------------------------------------------------------------------------------------------------------------------- The signature trick The fix starts from a fact that is easy to miss: every session already has a unique ID. A UUID, a slug, a key the harness assigned at boot. You do not need to invent identity. You need to surface it. The method: 1. Take the session key, append a fixed salt, and run it through SHA-256. 2. Read the digest in Crockford base32, an alphabet that drops I, L, O, and U so no character misreads as another and no code accidentally spells a word. 3. Keep five characters. Twenty-five bits, about 33 million codes. Collision odds across one hundred live sessions: roughly 0.015 percent. The result is a code like `tm:31T2J`. Deterministic. Same session key, same five characters, on any machine, forever. Before: two terminal panes, both titled "session", both indistinguishable. After: pane one reads `tm:31T2J`, pane two reads `tm:K7QX2`. The question "which one is doing the render" stops being memory work and becomes a glance. -----------------------------------------------------------------------------------------------------------------------------------------------------------